Clamp for curtain stretchers



Feb. 26 1924. I 1,485,015

A. J.- BROSEY CLAMP FOR cuamu swnsw casas ori inal Filed March 19. 1920 ilugum Patented Feb. 26, 1924.

ARTHUR J. BROSEY, OF CHICAGO, ILLINOIS.

CLAMP FOR CURTAIN STRETCHEBS.

Application filed March 19,1920, Serial To all whom it may concern:

Be it known that I, ARTHUR J. BRosEY, a

citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Clamps for Qurtain Stretchers, of which the following 1s a specification.

My invention relates to clamps for curtain stretchers and the important object is to provide improved clamping units for facilitating the clamping and supporting of curtains on stretching frames. The clamp of my invention is adapted to be slid along the stretcher side members and in its clamping ends has jaw plates which conform to the curvature of the bound edges of curtains to be supported. Preferably the jaw plates are sectional so that they may be fanned inwardly or outwardly to conform themselves to the curvature of the scallops or bound edge. The object is also to provide extended engagement of the clamping jaws with the curtain so as to prevent localization of strain and tearing of thread or fabric.

My improved structure is shown on the accompanying drawings, in which Fig. 1 is a plan view of the corner of a curtain stretcher showing the application of my improved clamps,

Fig. 2 is a plan view of one form of clamp,

Fig. 3 is a side view thereof,

Fig. 4 is a side View of another form of clamp, showing the clamp open,

Fig. 5 is a similar view of the clamp of Fig. 1 showing it closed,

Fig. 6 is a plan view of said clamp, and

Fig. 7 is an enlarged sectional view on plane 7-7, Fig. 5.

The clamps are each formed of sheet metal bent intermediate its ends and expanded at the bend to form a cylindrical sleeve or loop 10, these loops being of a diameter to easily receive the rods 11 of a stretcher frame (Fig. 1). In the form of clamp shown in Figs. 2 and 3 the limbs 12 and 13 of the clamp terminate in aw plates 14 and 15 which may be separate pieces secured to the limbs or which as shown in Figs. 2 and 3 may be integral with the limbs. The jaw plates are preferably ofiset inwardly a distance to provide the abutment shoulders 16 and 17, the jaw plates having then a continuous inner edge of any 170. 387,161. Renewed March 2 6, 1923.

desired curvature. This curvature is pref erably such as to parallel the curvature of the scalloped bound edges 18 of thecurtain C. The clamps are slipped onto the rods and the curtain edge can readily be slipped into the clamps between the limbs thereof to bring the jaw plates inside of the bound edge, and then the jaw plates are brought together as for example by wire'straps 19 which are slipped forwardly along the limbs 12' and 13. lVhen the curtain is now stretched all tension thereon is practically siderable area there will be no chance for concentration of strain on a few of the strands of the curtain and tearing is therefore prevented. The engagement of the jaw plate edges with the binding of the curtain also preserves the curvature of the binding and the scalloped efiect. After 9. ourtain has been thoroughly dried and stretched its longitudinal and transverse threads will be straight and the curtain will not be distorted or pulled out of shape in places but will be uniformly and accurately stretched.

In order to adapt the clamps for adjustment to fit curtain edges of difierent curvature and shape I preferably construct the jaw plates of segmental sections all pivoted at the ends of the limbs and adapted to be fanned or spread out more or less depending upon the are or extent of curvature of the curtain scallop. This arrangement is shown in Figs. 1, 5, and 6. The

various plate or fan sectors 20 are all pivoted at their geometric centers to the ends of the limbs 12 and 13 by a pin or rivet 21, there being any desired number of sectors pivoted to each limb. The sectors are fanned out to the desired degree so as to accurately lit the curvature at the curtain edges and the curved inner edges formed by the spread apart sectors fit and engage against the inner sides of the scallops and the straps 19 are then shifted along the clamp limbs to clamp the curtain between the jaw plates. Instead of utilizing straps for bringing together the limbs of the clamps, the clamps could be made of steel and primarily bent so that the spring action would tend to keep the jaw plates pressed together. The clamps could then be spreao apart sufficiently to receive the curtain where after their spring power would be sufficient to hold the plates in proper engagement with the curtain.

I claim as follows:

1. A clamp for curtain stretchers comprising opposed jaw members, and segmental jaw plates pivoted at the end of each of said jaw members to be spread out more or less to form jaw plate structures presenting curved inner edges for conforming to the curvature of the edges of the curtain to be supported, and means for forcing said jaw plate structures together.

2. A curtain supporting clamp comprising opposed jaw limbs, a plurality ofsegmental plates pivoted at their geometric centers to the end of each of said limbs with their curved edges presented inwardly, said segments being adapted to be fanned out more or less to present curved inner edges conforming with the curvature of the curtain edges to be stretched, and means for forcing said jaw limbs together.

3. A curtain supporting clamp for ourtain stretchers comprising opposed jaw limbs and adjustable jaw plates at the ends of said limbs presenting curved inner edges for conforming with the curvature of the binding of curtains to be stretched and means for forcing said jaw limbs together.

4. A clamp for curtain stretchers comprising opposed jaw members, segmental jaw plates secured at their apexes to the ends of said jaw members on the inner sides thereof so that their curved inner edges may abut against the binding of a curtain to be stretched when said jaw members are brought together to clamp the curtain, and means for forcing said jaw members together.

5. A curtain supporting clamp for curtain stretchers comprising opposing jaw limbs, and flat jaw plates secured against the inner sides of said limbs, said plates having convex inner edges, and means for forcing said limbs together to bring said plates into clamping engagement with curtains, said convex edges conforming with the curvature of and engaging against the binding of the curtains to be stretched.

In witness whereof, I hereunto subscribe my name this 15th day of March, A. D.,

ARTHUR J. BROSEY. 

